Scrum process finishes one feature at a time (all the way through testing). If specified scope takes 2X more time than expected, at least some features will be ready to ship.

Waterfall process parallelizes work across features at each stage, finishing all features at end. If specified scope takes 2X more time than expected, it may be that no features will be ready to ship, as all are still in process.

Other differences have more to do with customary practices than fundamental concepts (but in practice, make a huge difference).

Scrum is like “one waterfall per feature”, end-to-end through the development cycle.

How does Scrum Differ from Normal Project Management?

It doesn’t, really.

It just makes a less-familiar tradeoff in the “iron triangle” of scope, schedule, and resources.

Most non-software projects have a specified scope. One estimates schedule, and adjusts schedule to guarantee the scope.

Scrum projects have a specified schedule. One estimates scope, and adjusts scope to guarantee the schedule.

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